High-comfort seat-backrest linkage apparatus

Abstract

The present invention provides a high-comfort seat-backrest linkage apparatus, comprising a base, a backrest mounting member, a seat mounting member, a first connecting member, a second connecting member, and an elastic member. The backrest mounting member; the first connecting member and the second connecting member are all rotatably provided on the base; and the front portion of the seat mounting member is in sliding fit with the base, and the rear portion thereof is rotatably connected to the second connecting member. The elastic member is provided on the base, and the first connecting member acts on the elastic member when rotating. When a backrest is reclined, the backrest mounting member rotates to drive the first connecting member to rotate and compress the elastic member, and the second connecting member rotates along with the first connecting member and drives the seat mounting member to move backwards and downwards while reclining. Moreover, the rotating angle of the first connecting member is smaller than the rotating angle of the backrest mounting member, and the rotating angle of the second connecting member is larger than the rotating angle of the backrest mounting member. Therefore, when the backrest is reclined, the effects of reducing the rubbing sensation, maintaining lumbar support for the human body and providing uniform feedback are achieved, greatly improving the comfort and user experience.

Description

A highly comfortable seat-back linkage device Technical Field

[0001] The present invention relates to the field of furniture, and in particular to a seat-back linkage device with high comfort. Background Art

[0002] In existing seats, the chassis is an important component installed under the seat; the lifting of the seat, the adjustment of the reclining angle of the seat back and the linkage of the seat back are all completed by relying on the chassis; among them, the lifting of the seat is relatively conventional, and is used to adjust the leg flexion and extension comfortably for people of different heights. As people's requirements for seat comfort increase, the reclining of the seat back has gradually become a basic function. However, when the seat back is reclining, it will bring a rubbing feeling on the back, affecting comfort. In order to reduce the rubbing feeling, the seat back linkage function was also born.

[0003] The current common seat chassis is composed of a base, a seat mounting part, a backrest mounting part, a spring and other components, among which the backrest mounting part is arranged at the rear end of the base and can rotate relative to the base, and the seat mounting part is movably arranged at the upper end of the base; the seat is connected to the seat mounting part, the backrest mounting part is connected to the backrest, the backrest mounting part and the seat mounting part are linked, and the backrest mounting part also acts on the spring; the spring acts on the backrest mounting part, and when the user leans back on the chair back, the spring can provide a leaning force so that the chair back can actively reset. Technical issues

[0004] The low comfort of the above-mentioned chassis is mainly reflected in the following aspects:

[0005] 1. The travel of the chair seat moving with the chair back is short, and the back-rubbing feeling is still obvious;

[0006] 2. When the chair back is reclined, the gap between the seat and the back is too large, the waist of the human body is suspended in the air, and the back of the chair loses its support for the waist, which reduces comfort and affects the health of the waist and back;

[0007] 3. The compression of the spring is large, and the feedback given by the spring is uneven. When the chair back is leaning back, the user experience is poor. Technical Solutions

[0008] In order to solve the above technical problems, the present invention provides a high-comfort seat back linkage device, including a base, a chair back mounting part, a seat mounting part, a first connecting part, a second connecting part and an elastic part; the chair back mounting part, the first connecting part and the second connecting part are all rotatably arranged on the base, the front part of the seat mounting part slides with the base, and the rear part is rotatably connected to the second connecting part; the elastic part is arranged on the base, and the first connecting part acts on the elastic part when it rotates; when the chair back is reclined, the chair back mounting part rotates, driving the first connecting part to rotate and compressing the elastic part, the second connecting part rotates with the first connecting part and drives the seat mounting part to move, and the seat mounting part moves backward and downward on the base while tilting backward; and the rotation angle of the first connecting part is smaller than the rotation angle of the chair back mounting part, and the rotation angle of the second connecting part is greater than the rotation angle of the chair back mounting part; thereby, when the chair back is reclined, the effect of reducing the rubbing feeling of the back, maintaining the support of the human body's waist and uniform feedback is achieved, greatly improving comfort and usage experience.

[0009] The technical solution of the present invention is achieved as follows:

[0010] A high-comfort seat-back linkage device, comprising:

[0011] a base configured as a main support for the seat-back linkage device;

[0012] A seat back mounting member is configured to connect to the seat back of the seat; a first rotation connection point is provided on the base, and the seat back mounting member is rotationally connected to the base at the first rotation connection point;

[0013] A seat mounting member configured to connect to the seat of the chair; a front portion of the seat mounting member is slidably disposed on the base;

[0014] The first connecting member is transmission-connected to the chair back mounting member; a second rotation connection point is provided on the base, and the first connecting member is rotationally connected to the base at the second rotation connection point; the first connecting member is configured such that when the first connecting member rotates, it acts on the elastic member to deform the elastic member;

[0015] The second connecting member is transmission-connected to the first connecting member and the seat mounting member; a third rotation connection point is provided on the base, and the second connecting member is rotationally connected to the base at the third rotation connection point; the second connecting member is configured so that when the second connecting member rotates, the seat mounting member is driven to move on the base;

[0016] The elastic member is arranged on the base; the first connecting member acts on the elastic member;

[0017] When the chair back mounting part tilts backward, the chair back mounting part drives the first connecting part to rotate, and the first connecting part acts on the elastic part, causing the elastic part to deform; at the same time, the first connecting part drives the second connecting part to rotate, and the second connecting part drives the seat mounting part to move backward and downward while tilting backward; and the rotation angle of the first connecting part is smaller than the rotation angle of the chair back mounting part, and the rotation angle of the second connecting part is larger than the rotation angle of the chair back mounting part. Beneficial effects

[0018] The design starting point, concept and beneficial effects of the present invention using the above technical solution are:

[0019] In this solution, the biggest structural difference from the existing chassis is that the chair back mounting part and the chair seat mounting part are linked by two connecting parts, the first connecting part and the second connecting part; in the existing chassis, the elastic part is directly acted upon by the chair back mounting part. In this solution, although the chair back mounting part needs to pass through the first connecting part when acting on the elastic part, which seems to have added components, from the perspective of eliminating the rubbing feeling when the seat back is linked, the first connecting part and the second connecting part simplify the internal structure of the chassis, and achieve better comfort through a simple connecting rod linkage relationship. After the structure is simplified, the production and assembly are also simpler and faster, and the production efficiency is higher.

[0020] In addition, when the chair back is reclined, the rotation angles of the chair back mounting member, the first connecting member and the second connecting member are different. When the rotation angle of the chair back mounting member remains unchanged, the rotation angle of the first connecting member decreases relative to the chair back mounting member, while the rotation angle of the second connecting member increases relative to the chair back mounting member. Therefore, the rotation angle of the second connecting member is the largest, that is, the movement stroke of the second connecting member is the largest, which also increases the movement stroke of the seat mounting member and allows it to be closer to the chair back. On the one hand, this improves the effect of eliminating the back rubbing feeling, and on the other hand, it prevents the gap between the seat and the chair back from being too large. The elastic member provides elastic force to restore the chair back to its original position. The greater the deformation of the elastic member, the greater the elastic force generated. When the user lies back, it will feel more and more difficult to lie back. In this solution, the rotation angle of the first connecting member is the smallest, that is, the movement stroke of the first connecting member is the smallest, so that when the first connecting member acts on the elastic member, the deformation of the elastic member will be reduced. When the deformation is smaller, the change in the elastic force of the elastic member is more uniform, and there will be no difficulty in lying down when the chair back is tilted to the final angle, which improves the user's experience when leaning back on the chair.

[0021] When the seat back mount rotates, the first rotational connection point serves as the center of a circle, and the first rotational path serves as a corresponding arc. The relative position of the second rotational connection point to the first rotational connection point affects the rotation angle of the first connection point. The second rotational connection point is located outside the first rotational connection point and the first rotational path. Specifically, the line connecting the first rotational connection point and the midpoint of the first rotational path forms a circular area with the midpoint of the line as the center and the distance from the center of the circle to the first rotational connection point as the radius. The second rotational connection point is located outside the circular area. Due to the relationship between the arc length and the central angle, the angle formed by the second rotational connection point with respect to the two endpoints of the first rotational path is smaller than the angle formed by the first rotational connection point with respect to the two endpoints of the first rotational path. That is, the rotation angle of the first connection point will be smaller than the rotation angle of the seat back mount. This achieves: compared with a conventional chassis, at the same seat back mount rotation angle, the compression amount of the elastic member exerted by the first connection member is reduced, the elastic force feedback of the elastic member changes more uniformly, and the comfort of the seat back when reclining is improved.

[0022] Similarly, when the second connecting member rotates, the third rotation connection point is used as the center of the circle and the second rotation path is the corresponding arc. At this time, the rotation angle of the first connecting member has been determined by the seat back mounting member. The relative positional relationship between the second rotation connection point and the center arc will affect the rotation angle of the second connecting member. The second rotation connection point is located outside the third rotation connection point and the second rotation path, that is, the line connecting the third rotation connection point and the midpoint of the second rotation path, with the midpoint of the line as the center of the circle and the distance from the center of the circle to the first rotation connection point as the radius to form a circular area. The second rotation connection point is located outside the circular area. According to the relationship between the arc length and the central angle of the circle, the rotation angle of the second connecting member will be greater than the rotation angle of the first connecting member. Furthermore, when the third rotation connection point is located within the first rotation connection point and the first rotation path, the rotation angle of the second connecting member will be greater than the rotation angle of the seat back mounting member. In this way, compared with a conventional chassis, at the same seat back mounting member rotation angle, the movement distance of the seat mounting member is increased, the back rubbing feeling is reduced or even eliminated, and the comfort when reclining the seat back is improved.

[0023] According to the relationship characteristics of the arc length and the central angle of a circle, when the chair back mounting part rotates, in the transmission between the chair back mounting part and the seat mounting part, that is, in the linkage between the first connecting part and the chair back mounting part and in the linkage between the first connecting part and the second connecting part, the rotation angle of the first connecting part is the same. Therefore, the relative position of the second rotation connection point will affect the size of the rotation angle of the chair back mounting part and the second connecting part. Under this scheme, the rotation angle of the second connecting part can be made greater than the rotation angle of the chair back mounting part, thereby realizing a larger range of movement of the seat mounting part. When the chair back is tilted back, the seat can be closer to the chair back, preventing the gap between the seat and the chair back from being too large, losing support for the human waist, and reducing or even eliminating the feeling of rubbing the back. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic diagram of the three-dimensional structure of the seat back linkage device in an embodiment of the present invention;

[0025] FIG2 is a cross-sectional view of the seat back linkage device in an embodiment of the present invention;

[0026] FIG3 is a schematic diagram of the internal structure of the seat back linkage device in an embodiment of the present invention;

[0027] FIG4 is a schematic diagram of the three-dimensional structure of the coordination between the adjustment assembly, the elastic member and the action member in an embodiment of the present invention;

[0028] 5 is a schematic diagram illustrating the positional relationship between the first, second, third, fourth, and fifth rotational connection points and the rotation angles of the seat back mounting member, the first connection member, and the second connection member when the seat back reclines in an embodiment of the present invention;

[0029] 6 is a schematic diagram showing an embodiment of the present invention in which the ratio of the length of the second rotational connection point from the midpoint of the first rotational path to the rotation radius of the fourth rotational connection point is smaller than the ratio of the length of the second rotational connection point from the midpoint of the second rotational path to the rotation radius of the fifth rotational connection point;

[0030] FIG7 is a schematic diagram of the chair back mounting member driving the first connecting member to rotate when the chair back rotates in an embodiment of the present invention;

[0031] FIG8 is a schematic diagram of the first connecting member driving the second connecting member to rotate when the chair back rotates in an embodiment of the present invention;

[0032] FIG9 is a cross-sectional view of the seat back linkage device after the seat back mounting member is tilted backward in an embodiment of the present invention.

[0033] The figures are marked as follows: base 1; backrest mounting member 2; seat mounting member 3; first connecting member 4; linkage part 41; action part 42; second connecting member 5; elastic member 6; first slide groove 7; second slide groove 8; first sliding and rotating member 9; second sliding and rotating member 10; guide groove 11; straight rod 12; sleeve 13; limit plate 14; movable limit member 15; pressure rod 16; first rotation connection point A; second rotation connection point B; third rotation connection point C; fourth rotation connection point D; fifth rotation connection point E; first rotation path F; second rotation path G. Modes for Carrying Out the Invention

[0034] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0036] In the description of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0037] The specific implementation of the present invention is as follows:

[0038] As shown in Figures 1-3 and 9, the present invention provides a highly comfortable seat back linkage device, comprising:

[0039] Base 1, configured as the main support of the seat-back linkage device;

[0040] The backrest mounting member 2 is configured to connect to the backrest of the seat; the base 1 is provided with a first rotation connection point A, and the backrest mounting member 2 is rotatably connected to the base 1 at the first rotation connection point A;

[0041] The seat mounting member 3 is configured to connect to the seat of the chair; the front portion of the seat mounting member 3 is slidably disposed on the base 1;

[0042] The first connecting member 4 is in transmission connection with the chair back mounting member 2; the base 1 is provided with a second rotation connection point B, and the first connecting member 4 is rotatably connected to the base 1 at the second rotation connection point B; the first connecting member 4 is configured so that when the first connecting member 4 rotates, it acts on the elastic member 6, causing the elastic member 6 to deform;

[0043] The second connecting member 5 is in transmission connection with the first connecting member 4 and the seat mounting member 3; a third rotation connection point C is provided on the base 1, and the second connecting member 5 is rotationally connected to the base 1 at the third rotation connection point C; the second connecting member 5 is configured so that when the second connecting member 5 rotates, the seat mounting member 3 is driven to move on the base 1;

[0044] The elastic member 6 is provided on the base 1; the first connecting member 4 acts on the elastic member 6;

[0045] When the chair back mounting part 2 tilts backward, the chair back mounting part 2 drives the first connecting part 4 to rotate, and the first connecting part 4 acts on the elastic part 6, causing the elastic part 6 to deform; at the same time, the first connecting part 4 drives the second connecting part 5 to rotate, and the second connecting part 5 drives the seat mounting part 3 to move backward and downward while tilting backward; and, the rotation angle of the first connecting part 4 is smaller than the rotation angle of the chair back mounting part 2, and the rotation angle of the second connecting part 5 is larger than the rotation angle of the chair back mounting part 2.

[0046] In this solution, the biggest structural difference from the existing chassis is that the chair back mounting part 2 and the chair seat mounting part 3 are linked through two connecting parts, the first connecting part 4 and the second connecting part 5; in the existing chassis, the elastic part 6 is directly acted upon by the chair back mounting part 2. In this solution, although the chair back mounting part 2 needs to pass through the first connecting part 4 when acting on the elastic part 6, which seems to have added components, from the perspective of eliminating the rubbing feeling when the seat back is linked, the first connecting part 4 and the second connecting part 5 simplify the internal structure of the chassis, and achieve better comfort through a simple connecting rod linkage relationship. After the structure is simplified, the production and assembly are also simpler and faster, and the production efficiency is higher.

[0047] In addition, when the backrest is reclined, the rotation angles of the backrest mounting member 2, the first connecting member 4 and the second connecting member 5 are different. When the rotation angle of the backrest mounting member 2 remains unchanged, the rotation angle of the first connecting member 4 decreases relative to the backrest mounting member 2, while the rotation angle of the second connecting member 5 increases relative to the backrest mounting member 2. Therefore, the rotation angle of the second connecting member 5 is the largest, that is, the movement stroke of the second connecting member 5 is the largest, which also increases the movement stroke of the seat mounting member 3 and allows it to move closer to the backrest. On the one hand, this improves the effect of eliminating the back-rubbing feeling and on the other hand prevents the seat and backrest from being rubbed against each other. The gap between the two parts is too large, and the support for the human waist is lost; the elastic member provides elastic force to restore the chair back. The greater the deformation of the elastic member, the greater the elastic force generated. When the user lies back, it will feel more and more difficult to lie back. In this solution, the rotation angle of the first connecting member 4 is the smallest, that is, the rotation angle of the first connecting member 4 is the smallest, that is, the movement stroke of the first connecting member 4 is the smallest, so that when the first connecting member 4 acts on the elastic member 6, the deformation of the elastic member 6 will be reduced. When the deformation is smaller, the change of the elastic force of the elastic member 6 is more uniform, which improves the user's experience when leaning back on the chair back.

[0048] The above effects are achieved by setting the connection points between the components. Specifically:

[0049] As shown in Figures 5-8, the seat back mounting member 2 is provided with a fourth rotation connection point D, and the seat back mounting member 2 and the first connection member 4 are rotationally connected at the fourth rotation connection point D. The second connection member 5 is provided with a fifth rotation connection point E, and the first connection member 4 and the second connection member 5 are rotationally connected at the fifth rotation connection point E. When the seat back mounting member 2 rotates, the rotation path of the fourth rotation connection point D around the first rotation connection point A is a first rotation path F. When the second connection member 5 rotates, the rotation path of the fifth rotation connection point E around the third rotation connection point C is a second rotation path G. The second rotation connection point B is located outside the first rotation connection point A and the first rotation path F, the second rotation connection point B is located outside the third rotation connection point C and the second rotation path G, and the third rotation connection point C is located within the first rotation connection point A and the first rotation path F. In addition, the ratio of the length of the second rotation connection point B from the midpoint of the first rotation path F to the rotation radius of the fourth rotation connection point D is less than the ratio of the length of the second rotation connection point B from the midpoint of the second rotation path G to the rotation radius of the fifth rotation connection point E.

[0050] When the seatback mount 2 rotates, the first rotational connection point A serves as the center of the circle, and the first rotational path forms a corresponding arc. The relative position of the second rotational connection point B affects the rotation angle of the first connecting member 4. The second rotational connection point B is located outside the first rotational connection point A and the first rotational path F. Specifically, the line connecting the first rotational connection point A and the midpoint of the first rotational path F forms a circular region with the midpoint of this line as the center and the distance from the center of this circle to the first rotational connection point A as the radius. The second rotational connection point B is located outside this circular region. Due to the relationship between arc length and central angle, the angle formed by the second rotational connection point B with the two endpoints of the first rotational path F is smaller than the angle formed by the first rotational connection point A with the two endpoints of the first rotational path F. In other words, the rotation angle of the first connecting member 4 will be smaller than the rotation angle of the seatback mount 2. This achieves: compared to a conventional chassis, at the same rotation angle of the seatback mount 2, the compression of the elastic member 6 by the first connecting member 4 is reduced, making the elastic force feedback of the elastic member 6 more uniform, thereby improving the comfort when the seatback is reclined.

[0051] Similarly, when the second connecting member 5 rotates, the third rotation connection point is used as the center of the circle, and the second rotation path is the corresponding arc. At this time, the rotation angle of the first connecting member 4 has been determined by the chair back mounting member 2. The relative position relationship between the second rotation connection point B and the center of the arc will affect the rotation angle of the second connecting member 5. The second rotation connection point B is located outside the third rotation connection point C and the second rotation path G, that is, the line connecting the third rotation connection point C and the midpoint of the second rotation path G. The midpoint of the line is used as the center of the circle, and the distance from the center of the circle to the first rotation connection point A is used as the radius to form a circular area. domain, the second rotation connection point B is located outside the circular area. According to the relationship characteristics of the arc length and the central angle, the rotation angle of the second connection member 5 will be greater than the rotation angle of the first connection member 4 at this time; further, the third rotation connection point C is located within the first rotation connection point A and the first rotation path F, and the rotation angle of the second connection member 5 will be greater than the rotation angle of the backrest mounting member 2, thereby achieving: relative to the conventional chassis, at the same rotation angle of the backrest mounting member 2, the movement distance of the seat mounting member 3 is increased, the rubbing feeling of the back is reduced or even eliminated, and the comfort when the backrest is reclined is improved.

[0052] Furthermore, according to the relationship characteristics of the arc length and the central angle, when the chair back mounting part 2 rotates, in the transmission between the chair back mounting part 2 and the seat mounting part 3, that is, in the linkage between the first connecting part 4 and the chair back mounting part 2 and in the linkage between the first connecting part 4 and the second connecting part 5, the rotation angle of the first connecting part 4 is the same. Therefore, the relative position of the second rotation connection point B will affect the rotation angle of the chair back mounting part 2 and the second connecting part 5. Under this scheme, the rotation angle of the second connecting part 5 can be made greater than the rotation angle of the chair back mounting part 2, thereby realizing a larger range of movement of the seat mounting part 3. When the chair back is tilted back, the seat can be closer to the chair back, preventing the gap between the seat and the chair back from being too large, losing support for the human waist, and reducing or even eliminating the feeling of rubbing the back.

[0053] In order to achieve that the rotation angle of the first connecting member 4 is smaller than the rotation angle of the chair back mounting member 2, and the rotation angle of the second connecting member 5 is greater than the rotation angle of the chair back mounting member 2, there can be multiple relative position relationships among the first rotation connection point A, the second rotation connection member and the third rotation connection point C; but from the perspective of production and product design, whether considering the mold opening cost or the smoothness of movement, etc., the first rotation connection point A is located below and behind the second rotation connection point B; the third rotation connection point C is located below and behind the first rotation connection point A, which is an easy-to-implement and preferred solution.

[0054] Furthermore, since the backrest mounting member 2, the first connecting member 4 and the second connecting member 5 are all rotatably connected to the base 1, if the backrest mounting member 2, the first connecting member 4 and the second connecting member 5 are to be linked, the three cannot be simply rotatably connected. Therefore, the first connecting member 4 is provided with a first slide groove 7 and a second slide groove 8, the backrest mounting member 2 is provided with a first sliding rotation member 9, and the second connecting member 5 is provided with a second sliding rotation member 10; the first sliding rotation member 9 is rotatably connected to the backrest mounting member 2, the first sliding rotation member 9 is arranged in the first slide groove 7 and slidably cooperates with the first connecting member 4, the second sliding rotation member 10 is rotatably connected to the second connecting member 5, the second sliding rotation member 10 is arranged in the second slide groove 8 and slidably cooperates with the first connecting member 4.

[0055] The front part of the seat mounting member 3 is connected to the base 1 through a guide groove 11 and a guide member (not shown), and the guide groove 11 is arranged to be tilted downward from front to back; the second sliding rotating member 10 is located on the upper part of the first connecting member 4, and the rotation connection point of the second connecting member 5 and the seat mounting member 3 is located above the second sliding rotating member 10. When the chair back mounting member 2 rotates, the second sliding rotating member 10 rotates downward and backward, driving the second connecting member 5 to rotate downward and backward, and the seat mounting member 3 moves backward and downward while tilting backward; the seat mounting member 3 is slidably set on the base 1, and when the second connecting member 5 drives the seat mounting member 3 to move, the seat mounting member 3 will slide on the base 1, and the movement trajectory of the seat mounting member 3 will be determined by the guide groove 11 on the base 1 and The rotation trajectory of the second connecting member 5 is determined by the guide groove 11 and the guide member, which can limit the movement trajectory of the seat mounting member 3 on the base 1, allowing the seat mounting member 3 to move along the preset trajectory; while the seat mounting member 3 moves backward and tilts backward, the front height also decreases, making the backward tilt angle of the seat mounting member 3 gentle, preventing the front of the seat mounting member 3 from pressing on the human thigh, further improving comfort; moreover, when the backrest mounting member 2 rotates, the displacement of the first sliding rotating member 9 in the front-to-back direction is less than the displacement of the second sliding rotating member 10 in the front-to-back direction, allowing the front-to-back displacement of the seat mounting member 3 connected to the second connecting member 5 to be greater, and closer to the backrest, preventing the gap between the seat and the backrest from being too large, thereby losing support for the human waist.

[0056] When the backrest is tilted, the seat back mounting part 2 is rotated downwards, and the backrest mounting part 2 is rotated downwards. When the backrest mounting part 2 and the seat mounting part 3 are directly connected to the fourth rotation connection point D, the backrest mounting part 2 cannot give the seat mounting part 3 a displacement to move backwards. The seat mounting part 3 is connected to the second connection part 5, and the third rotation connection point C is located below the fifth rotation connection point E. The movement trajectory of the fifth rotation connection point is to move both downwards and backwards, so that the second connection part 5 produces a displacement in the front-to-back direction, which can effectively drive the seat mounting part 3 to move backwards and downwards, preventing the seat and the backrest from moving away and causing the human body's waist to hang in the air; if the second connection part 5 is cancelled, when the seat mounting part 3 is connected to the first connection part 4 or the backrest mounting part 2, the stroke amplification effect brought by the second connection part 5 will be lost, so that the stroke of the seat mounting part 3 will be reduced, and the effect of this scheme cannot be achieved.

[0057] The influence of the guide groove 11 on the implementation effect: the seat mounting part 3 is not simply connected to the base 1 by rotation, nor is it connected to the base 1 through a connecting rod at the front. Because if the seat mounting part 3 is directly connected to the base 1 by rotation, the seat mounting part 3 as a whole cannot be displaced in the front and rear directions, and the seat cannot be moved toward the chair back. The gap between the seat and the chair back will become larger, and the human waist will be suspended in the air without the support of the chair back. Moreover, if the seat mounting part 3 only rotates, the tilt angle of the seat will be larger, which will compress the thighs. If the seat mounting part 3 is connected to the base 1 through the front connecting rod, the front of the seat mounting part 3 can be easily lifted. If the rear of the seat mounting part 3 is a movement of lowering the height, the seat will tilt significantly forward and backward, and the front end of the seat will compress the human thighs, affecting the comfort of use. The guide groove 11 can also make the seat mounting part 3 move according to the preset trajectory and finally reach the required position.

[0058] As shown in Figures 1-4 and 9, the base 1 is a semi-open shell of the chassis, and the interior is hollow, and the guide grooves 11 are arranged on the left and right sides of the front of the base 1; the first sliding rotating member 9 and the second sliding rotating member 10 both include sliders and shafts, the sliders are respectively arranged in the first slide groove 7 and the second slide groove 8 and slide with them, and the shaft is inserted in the slider and rotates with them; in order to install the elastic member 6 and prevent the elastic member 6 from being separated from the corresponding position and losing its function, an adjustment component is provided in the base 1, and the elastic member 6 is arranged on the adjustment component The adjustment component includes a straight rod 12 and a sleeve 13 arranged roughly along the front-to-back direction. The straight rod 12 is inserted in the sleeve 13 and can be telescopically matched with the sleeve 13. The elastic member 6 is sleeved on the straight rod 12 and the sleeve 13; a limit plate 14 is fixedly installed on the straight rod 12, and a movable limit member 15 is provided on the sleeve 13. The elastic member 6 is arranged between the limit plate 14 and the elastic stop block. The limit plate 14 and the movable limit member 15 are respectively located on both sides of the elastic member 6 for compressing the elastic member 6, and the elastic member 6 can also generate a corresponding reaction force.

[0059] The elastic member 6 is a spring, which is arranged roughly horizontally inside the base 1 along the front-to-back direction, and the straight rod 12 and the sleeve 13 are inclined downward from front to back, and the elastic member 6 installed thereon is also slightly inclined downward from front to back; a pressure rod 16 is provided at one end of the first connecting member 4 facing the elastic member 6, and the pressure rod 16 acts on the elastic member 6 through the movable limit member 15, and the pressure rod 16 is configured so that when the chair back mounting member 2 rotates backward, the pressure rod 16 pushes the movable limit member 15 to compress the elastic member 6; when the first connecting member 4 rotates, the pressure rod 16 acts on the elastic member 6 to compress the elastic member 6; correspondingly, the elastic member 6 will give the pressure rod 16 and the first connecting member 4 corresponding elastic force, and the human back will also feel the elastic force.

[0060] The first connecting member 4 is roughly L-shaped, and the first connecting member 4 includes a roughly horizontal linkage portion 41 and a roughly vertical action portion 42. The first slide groove 7 and the second slide groove 8 are both provided on the linkage portion 41, and the first slide groove 7 is located below the second slide groove 8. When the chair back is not reclined, the first slide groove 7 is tilted downward from front to back, and the second slide groove 8 is slightly tilted upward from front to back; the upper end of the action portion 42 is connected to the front end of the linkage portion 41, and the connection between the action portion 42 and the linkage portion 41 is the rotation connection point between the first connecting member 4 and the base 1; the pressure rod 16 is installed at the lower end of the action portion 42. When the first connecting member 4 rotates, The pressure rod 16 moves forward and upward to compress the elastic member 6; the elastic member 6 abuts against the limit plate 14 and the movable limit member 15; the movable limit member 15 is connected to the pressure rod 16, and the movable limit member 15 is configured so that when the chair back mounting member 2 rotates backward, the first connecting member 4 rotates and drives the pressure rod 16 to move, and the pressure rod 16 drives the movable limit member 15 to compress the elastic member 6; wherein, the pressure rod 16 rotates together with the first connecting member 4, and the direction of action of the movable limit member 15 on the spring is linear, so an angular change is required, so the pressure rod 16 rotates in coordination with the first connecting member 4, and the pressure rod 16 rotates in coordination with the movable limit member 15.

[0061] In the existing chassis, when the backrest is tilted backward, the compression amount of the elastic member 6 is too large, the elastic force changes quickly, the change range is large, and the change is uneven, which affects the feeling of the human body during the backrest. In this process, the direction of force is changed and transmitted through a single rotating shaft, and the backrest mounting member 2 and the first connecting member 4 are integrated. The angle of the backrest tilting backward is the angle of rotation of the backrest mounting member 2, and the angle when the elastic member 6 is acted on is also the same. Finally, the deformation amount generated by the elastic member 6 is within a range. In this solution, the force transmission is decomposed and the force is transmitted through the backrest mounting member 2 and the first connecting member 4. The first connecting member 4 is realized by the rotational movement of the two. When the chair back tilts backward, the chair back mounting member 2 rotates accordingly. The chair back mounting member 2 and the first connecting member 4 are linked to drive the first connecting member 4 to rotate, and the first connecting member 4 rotates to act on the elastic member 6. In the whole process, the number of rotation connection points is increased to two, so that the rotation angle of the first connecting member 4, that is, the angle when the elastic member 6 acts, can form a difference with the angle of the chair back tilting. By reducing the rotation angle of the first connecting member 4, the deformation of the elastic member 6 is reduced, and finally the deformation range of the elastic member 6 is reduced.

[0062] After the deformation range of the elastic part 6 is reduced, the change of elastic force is more uniform, and the reaction force exerted by the chair back on the human back is also more uniform. When leaning back, the human body feels more comfortable and more ergonomic. This tiny change can bring about a leap-forward improvement, allowing users to experience a new and more comfortable chair back lying experience.

[0063] We know that no matter what stroke the spring is in, the more it is compressed, the faster the change and the more uneven it is; the less it is compressed, the slower the change and the more uniform it is; in a conventional chassis, the spring stroke is generally around 1-2cm. This solution can reduce the deformation by a quarter of the original shape. Reducing the deformation by only a quarter may seem small, but this quarter of the deformation is the hardest part of the conventional chassis and the part with the largest elastic force change. As a result, the elastic force generated by the deformation of the elastic part 6 that works in this solution is kept in a lower range, and most importantly, the change in elastic force is made more uniform.

Claims

1. A high-comfort seat back linkage device, characterized in that: include: a base configured as a main support of the seat-back linkage device; A seat back mounting member is configured to be connected to the seat back of the seat; a first rotation connection point is provided on the base, and the seat back mounting member is rotationally connected to the base at the first rotation connection point; A seat mounting member configured to connect to a seat of the chair; a front portion of the seat mounting member being slidably disposed on the base; The first connecting member is transmission-connected to the chair back mounting member; a second rotation connection point is provided on the base, and the first connecting member is rotationally connected to the base at the second rotation connection point; the first connecting member is configured so that when the first connecting member rotates, it acts on the elastic member to deform the elastic member; The second connecting member is drivingly connected to the first connecting member and the seat mounting member; a third rotating connection point is provided on the base, and the second connecting member is rotationally connected to the base at the third rotating connection point; the second connecting member is configured so that when the second connecting member rotates, the seat mounting member is driven to move on the base; An elastic member is arranged on the base; and a first connecting member acts on the elastic member; When the chair back mounting part tilts backward, the chair back mounting part drives the first connecting part to rotate, and the first connecting part acts on the elastic part, causing the elastic part to deform; at the same time, the first connecting part drives the second connecting part to rotate, and the second connecting part drives the seat mounting part to move backward and downward while tilting backward; and, the rotation angle of the first connecting part is smaller than the rotation angle of the chair back mounting part, and the rotation angle of the second connecting part is larger than the rotation angle of the chair back mounting part.

2. The high-comfort seat back linkage device according to claim 1, characterized in that: A fourth rotation connection point is provided on the seat back mounting member, and the seat back mounting member and the first connection member are rotationally connected at the fourth rotation connection point. A fifth rotation connection point is provided on the second connection member, and the first connection member and the second connection member are rotationally connected at the fifth rotation connection point. When the seat back mounting member rotates, the rotation path of the fourth rotation connection point around the first rotation connection point is the first rotation path. When the second connection member rotates, the rotation path of the fifth rotation connection point around the third rotation connection point is the second rotation path. The second rotation connection point is located outside the first rotation connection point and the first rotation path, the second rotation connection point is located outside the third rotation connection point and the second rotation path, and the third rotation connection point is located within the first rotation connection point and the first rotation path.

3. The high-comfort seat back linkage device according to claim 2, characterized in that: The ratio of the length of the second rotation connection point from the midpoint of the first rotation path to the rotation radius of the fourth rotation connection point is smaller than the ratio of the length of the second rotation connection point from the midpoint of the second rotation path to the rotation radius of the fifth rotation connection point.

4. The high-comfort seat back linkage device according to claim 1, characterized in that: The first rotation connection point is located at the rear and lower part of the second rotation connection point; the third rotation connection point is located at the rear and lower part of the first rotation connection point.

5. The high-comfort seat back linkage device according to claim 1, characterized in that: The first connecting member is provided with a first slide groove and a second slide groove, the chair back mounting member is provided with a first sliding rotating member, and the second connecting member is provided with a second sliding rotating member; the first sliding rotating member is rotatably connected to the chair back mounting member, the first sliding rotating member is arranged in the first slide groove and slidably cooperates with the first connecting member, the second sliding rotating member is rotatably connected to the second connecting member, the second sliding rotating member is arranged in the second slide groove and slidably cooperates with the first connecting member.

6. The high-comfort seat back linkage device according to claim 5, characterized in that: The second sliding rotating member is located on the upper part of the first connecting member. When the chair back mounting member rotates, the second sliding rotating member rotates downward and backward, driving the second connecting member to rotate downward and backward, and the chair seat mounting member moves backward and downward accordingly while tilting backward.

7. The high-comfort seat back linkage device according to claim 5, characterized in that: When the seat back mounting member rotates, the displacement of the first sliding rotating member in the front-to-back direction is smaller than the displacement of the second sliding rotating member in the front-to-back direction.

8. The high-comfort seat back linkage device according to claim 5, characterized in that: The rotation connection point between the second connecting member and the seat mounting member is located above the second sliding rotating member.

9. The high-comfort seat back linkage device according to claim 1, characterized in that: The front part of the seat mounting piece is connected with the base through a guide groove and a guide piece, and the guide groove is arranged to be inclined downward from the front to the rear.

10. The high-comfort seat back linkage device according to claim 1, characterized in that: The elastic member is arranged in the base roughly along the front-rear direction; a pressure rod is provided at one end of the first connecting member facing the elastic member, and the pressure rod acts on the elastic member, and the pressure rod is configured to compress the elastic member when the chair back mounting member rotates backward.

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